package com.itheima.controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.itheima.domain.Student;
import com.itheima.service.StudentService;
import com.itheima.service.impl.StudentServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/studentServlet")
public class StudentServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        StudentService service = new StudentServiceImpl();
        List<Student> students = service.find();

        //响应json

        ObjectMapper objectMapper  = new ObjectMapper();

        String s = objectMapper.writeValueAsString(students);

        resp.getWriter().write(s);//[{},{},{}]
    }
}
